// Problem: 
// Contest: 
// URL: 
// Memory Limit: 
// Time Limit: 
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#include<bits/stdc++.h>
using namespace std;
#define int long long
inline int read(){
	int s=0,w=1;
	char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
	while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
	return s*w;
}
signed main()
{
	int a,b;
	char c;
	cin>>a>>b>>c;
	if(c=='+')cout<<a+b;
	else if(c=='-')cout<<a-b;
	else if(c=='*')cout<<a*b;
	else if(c=='/')
	{
		if(b==0)cout<<"Divided by zero!";
		else cout<<a/b;
	}
	else cout<<"Invalid operator!";
	return 0;
}
